641599398001 has 3 divisors (see below), whose sum is σ = 641600199001. Its totient is φ = 641598597002.

The previous prime is 641599397941. The next prime is 641599398029. The reversal of 641599398001 is 100893995146.

The square root of 641599398001 is 800999.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 641599398001 - 2¹⁷ = 641599266929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641599398091) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 400500 + ... + 1201498.

Almost surely, 2^641599398001 is an apocalyptic number.

641599398001 is the 800999-th square number.

641599398001 is the 400500-th centered octagonal number.

It is an amenable number.

641599398001 is a deficient number, since it is larger than the sum of its proper divisors (801000).

641599398001 is an frugal number, since it uses more digits than its factorization.

641599398001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601998 (or 800999 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 641599398001 in words is "six hundred forty-one billion, five hundred ninety-nine million, three hundred ninety-eight thousand, one".